Add copyright header to generated analyzer files.

pkg/analyzer/lib/src/generated/utilities_collection.dart

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.utilities.collection;
 
 import 'java_core.dart';
 import 'scanner.dart' show Token;
 
 /**
  * The class `BooleanArray` defines methods for operating on integers as if they were arrays
@@ skipping 106 matching lines @@
    *
    * @param list the list to which the elements are to be added
    * @param elements the elements to be added to the list
    */
   static void addAll(List list, List<Object> elements) {
     for (Object element in elements) {
       list.add(element);
     }
   }
 }